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Sensors (Basel, Switzerland)
|April 3, 2020
PubMed
Summary

This study introduces a robust real-valued estimator to improve direction-of-arrival (DOA) estimation in uniform rectangular arrays (URAs) by mitigating mutual coupling effects. The method enhances computational efficiency and maintains accuracy for wireless communication signals.

Keywords:
DOA estimationRARE.mutual couplingrectilinear sources

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Area of Science:

  • Signal Processing
  • Wireless Communications
  • Array Signal Processing

Background:

  • Digital communication signals can exhibit noncircularity, offering enhanced degrees of freedom for direction-of-arrival (DOA) estimation.
  • Mutual coupling between sensors in uniform rectangular arrays (URAs) significantly degrades DOA estimation performance.

Purpose of the Study:

  • Develop a robust real-valued estimator to address unknown mutual coupling in URAs for improved DOA estimation.
  • Enhance computational efficiency and accuracy in DOA estimation for noncircular signals in URAs.

Main Methods:

  • Constructed an augmented covariance matrix using real and imaginary parts of observations.
  • Reparameterized the steering vector to incorporate mutual coupling effects and utilize the rank reduction (RARE) property.
  • Decoupled the 2D spectral search into two 1D searches for reduced computational complexity.

Main Results:

  • The proposed method provides DOA estimates robust to unknown mutual coupling.
  • Achieved estimation performance comparable to 2D spectral search methods but with significantly reduced computational cost.
  • Demonstrated superior computational efficiency through real-valued operations and decoupled spectral searches.

Conclusions:

  • The developed real-valued estimator effectively mitigates mutual coupling in URAs for DOA estimation.
  • The proposed approach offers a computationally efficient and accurate alternative for direction-of-arrival estimation in wireless systems.
  • This method enhances the practical applicability of DOA estimation in scenarios with noncircular signals and array mutual coupling.